Simple and cost-effective pH and T sensors from top to bottom: new chemical probes based on sonogel-carbon transducers for plasma analyses
- Laura Cubillana-Aguilera
- Juan José García-Guzmán
- Álvaro Jesús Sainz-Calvo
- Alfonso Sierra-Padilla
- Dolores Bellido-Milla
- José María Palacios-Santander
Publisher: Eleventh International Workshop on Biosensors
Year of publication: 2024
Pages: 35
Type: Conference paper
Sustainable development goals
Abstract
The present work introduces two novel approaches to fabricate simple and cost-effectivepH and temperature probes. Sinusoidal voltage methodologies were employed toelectrodeposit polyaniline (PANI) at different growth times (10–20 min) on the surface ofan affordable Sonogel-Carbon electrode to conform a robust pH sensor. The presence ofPANI and its phases were corroborated by electrochemical means. The sensibility,reversibility and selectivity of the produced sensor were very adequate to apply it inphysiological samples. In this regard, the proposed sensor was evaluated in artificial bloodserum as well as untreated plasma samples obtaining outstanding results in comparisonwith a gold reference technique (error <2 %). In addition, a new composite sonogelmaterial, intrinsically modified with multiwalled carbon nanotubes, was attached on top ofan electrode couple to one-step fabricate a new temperature probe, relating resistance ofthe probe with the surroundings temperature. In this case, an optical microscopycharacterization was performed to study the sturdiness of the layer. Remarkably, suitableresults in terms of sensitivity and selectivity were obtained. The probes were assessed inartificial and untreated plasma samples as well, with the corresponding validation step(error <1 %) by using a commercial temperature probe.